Read my lips
Definition 1 of 1
Pro Tip 1/3Emphasis on Truth
Used to stress that the speaker is telling the absolute truth and should be taken seriously. 
Read my lips: no new taxes.
Pro Tip 2/3Not Literal
It's an expression, not about actually reading lips but about understanding and believing the message. 
Read my lips, we're not getting back together.
Pro Tip 3/3Strong Denial
Commonly used to deny something emphatically or to end an argument. 
Read my lips: I did not do it.